If you said two serpents wrapped around a winged staff, you would be right — and wrong.

The story of the symbol representing medical care is one of mistaken identity. In the United States, we usually think of the caduceus, two snakes twisted around a winged staff. Its origins go back to antiquity, where it was carried by the Greek god Hermes and represented commerce and negotiation. It was later appropriated by the Roman god Mercury. The caduceus never referred to medicine (or at least the essence of healing), but it looks very much like the Greek Rod of Asclepius (composed of a single snake and staff, no wings), which does. What happened?

It appears that when the U.S. Army Medical Corps developed their branch logo in 1902 they picked the wrong symbol, and it has permeated American medical graphics ever since.

Here are examples of these images from the Kaiser Permanente archives. Some are from our own organization, some are external, and some display various combinations of the two logos. Click on one to engage slideshow.